#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>


int main(){
    printf("进程,PID = %d, PPID = %d\n",getpid(),getppid());
    pid_t id = fork();
    if(id == 0){
        while(1)
        {
            printf("子进程:PID = %d, PPID = %d\n",
                    getpid(),getppid());
            sleep(1);
        }
    }else if(id > 0){
        while(1)
        {
            printf("父进程:PID = %d, PPID = %d\n",
                    getpid(),getppid());
            sleep(1);
        }
    }else{
        //
    }
    return 0;
}
